
Advanced Technology and Systems Co., Ltd.
2 4
4.2.8
Forced Data Reconstruction
Normally, when two drives fail, it is necessary to save the remaining data onto back-up media (e.g.
tape) and replace the failed drives. If back-up media are unavailable, the ArrayMasStor allows users
to perform forced data reconstruction. During forced data reconstruction, the ArrayMasStor detects
the unrecoverable read errors in the source drives, skips the damaged sector and continues to
reconstruct from the next sector, until the last sector has been reconstructed. The data in the sector or
sectors with unrecoverable errors are either damaged or lost.
When two drives fail, DRIVE X Y FAIL appears on LCD display, where X is the physical number of
the first failed drive. Replace the first failed drive (X) before replacing the second failed drive (Y).
(Note: If the second failed drive (Y) is replaced before the first failed drive (X), the ArrayMasStor
enters system halt mode and the host computer cannot access the data in the ArrayMasStor. If this
happens, swap drives X and Y and then restart the ArrayMasStor.)
After replacing the first failed drive, FORCE RECON appears on the display. This menu appears
when the source drive failed during normal reconstruction mode, without replacement of the first
failed drive. Press the select button to start forced data reconstruction. When the data reconstruction
is complete, the ArrayMasStor enters degrade mode (when only one failed drive is left), or degrade
mode-2 (when more than one failed drives are left), except spare drive.
The display indicates that two drives have failed. Replace the first
failed drive (x), before replacing the second failed drive (y).
The display indicates that the first failed drive has been replaced.
Press the select button to start forced data reconstruction.
Press the select button again to confirm the start of force data
reconstruction. If the cancel button is pressed, the display returns to
the main menu and reconstruction is cancelled.
Press the select button again to confirm the start of forced data
reconstruction.
The display indicates the forced data reconstruction has started, and
indicates the drive that is being reconstructed, and the progress (in
percent) of the reconstruction process. When forced data
reconstruction is complete, the display returns to degraded mode or
degraded mode-2 menu.
RECONSTRUCTION
O TO START OR X
DEGRADED MODE-2
DRIVE x y FAIL
DEGRADED MODE-2
-FORCE RECON
RECON STARTED
PRESS O
RECONSTRUCTION
DRIVE x n%